Piper Cherokee Arrow II Pilots Operating Manual page 148

ARROW I1
The cruising speed of the Cherokee Arrow I1 is determined by many factors, including
power setting, altitude. temperature, loading, and equipment installed on the airplane. The
normal cruising power is 75% of the rated horsepower of the engine. True airspeeds which may
be obtained at various altitudes and power settings can be determined from the charts in
"Section XIII" of this manual.
When selecting RPM below 2400, limiting manifold pressure for continuous operation, as
specified by the Lycoming Operator's Manual, should be observed.
To INCREASE power, first increase RPM (propeller control); then increase manifold
pressure (throttle control).
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To DECREASE power, first decrease manifold pressure (throttle); then decrease RPM
(propeller control).
Use of the mixture control in cruising flight reduces fuel consumption significantly,
especially at higher altitudes. The mixture should be leaned during cruising operation above
5000 feet altitude and at the pilot's discretion at lower altitudes when 75% power or less is
being used. If any doubt exists as to the amount of power being used, the mixture should be in
the FULL RICH position for all operations under 5000 feet.
To lean the mixture, disengage lock* and pull the mixture control until the engine
becomes rough, indicating that the lean mixture limit has been reached in the leaner cylinders.
Then enrich the mixture by pushing the control toward the instrument panel until engine
operation becomes smooth. The fuel flow meter will give a close approximation of the fuel
being consumed.
If the airplane is equipped with the optional exhaust gas temperature (EGT) gauge, a more
accurate means of leaning is available to the pilot. For this procedure, refer to the Avco
Lycoming Operator's Manual.
In order to keep the airplane in best lateral trim during cruising flight, the fuel should be
used alternately from each tank. It is recommended that one tank be used for one hour after
take-off, then the other tank be used for two hours, then return to the first tank for one hour.
Each tank will then contain approximately 112 hour of fuel if tanks were full (24 gallons usable
each tank) at take-off. Do not run tanks completely dry in flight.
NOTE
There are no mechanical uplocks in the landing gear system. In
the event of a hydraulic system malfunction, the landing gear will
free fall to the gear down and locked position. The pilot should
be aware that the airplane true airspeed with gear down is
approximately 75% of the gear retracted airspeed for any given
power setting. Allowances for the reduction in airspeed and range
should be made when planning extended flight between remote
airfields or flight over water.
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*Serial nos. 7535001 and up
OPERATING INSTRUCTIONS
REVISED:
JUNE
18,1974